US Patent 7556751 Photochromic materials having electron-withdrawing substituents
Patent 7556751 was granted and assigned to Transitions Optical on July, 2009 by the United States Patent and Trademark Office.
Is a
Current Assignee
Date Filed
December 21, 2005
Date of Patent
July 7, 2009
Patent Application Number
11314141
Patent Jurisdiction
Patent Number
Patent Primary Examiner
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